Noida/New Delhi, June 15 (IANS) Taking forward its probe into the month-old Noida double murders of teenaged Aarushi Talwar and her family’s domestic help, the Central Bureau of Investigation (CBI) Sunday said her mother Nupur Talwar too could be arrested even as a team intensified searches at their home. The agency conducted a third lie-detector test on Nupur Talwar, and said her statements contradicted those of her arrested husband, Rajesh Talwar. A CBI official said Nupur could be arrested on the basis of her statements.

“We have conducted three lie-detectors tests on Nupur Talwar since Friday. Two tests were conducted at the All India Institute of Medical Sciences (AIIMS), including one today, and one at the Central Forensic Science Laboratory (CFSL), Delhi,” said the official.

He said Nupur’s statements contradicted those made by her husband before investigators. Rajesh Talwar has been arrested for his alleged involvement in the May 15 night double murders of his daughter and the family’s domestic help Hemraj.

Earlier Sunday, the investigating agency carried out a psychological analysis test on Rajesh Talwar in Dasna Jail in Ghaziabad.

During the test, a polygraph instrument collects physiological data, including changes in sweat gland activity, blood pressure and heartbeat, as questions are put to the person.

“The test will also help in establishing the chain of events on the night of the incident, as to who was killed first,” a CBI source said.

A close friend of Aarushi, wishing anonymity, told IANS that she loved her father very much and was planning to gift him a hand-made painting on Father’s Day (June 15).

On Saturday, Rajesh Talwar’s compounder Krishna was remanded in CBI custody for three days. He was arrested Friday evening after a series of scientific tests, including narco analysis, were conducted on him in Bangalore.

Aarushi, 14, was found killed in her Noida home on May 16 morning. While the police initially named missing domestic help Hemraj as the main suspect, they found his body on the terrace of the house the next day. Rajesh Talwar was arrested May 23 as a prime suspect.

Meanwhile, the CBI intensified its searches in and around the Talwars’ residence in Jalyayu Vihar. A team visited the locked house in the morning, reached the rooftop, walked up to Krishna’s room and then came down.

The sleuths also visited the sector-53 residence of Anita Durrani, a dentist like the Talwar couple, who ran a clinic in association with Rajesh, and came back within a few minutes after inspecting the servant room there.

The team took with them Durrani’s domestic help Raj Kumar, who was close to Hemraj.

The CBI visited Durrani’s house also late Friday night and Saturday and interrogated her and her husband as well as Raj Kumar.

According to CBI sources, Raj Kumar mentioned that three people were involved in the murders of Aarushi and Hemraj.

Also Saturday, the CBI cordoned off the Talwars’ home and thoroughly checked the water tanks on the terrace and the water pipes to search for the missing murder weapon.

According to CBI sources, the agency received an anonymous tip-off about the murder weapon, now believed to be a khukri, a curved short knife. The Noida police had earlier said the murders were committed with a surgical knife.

CBI sources said more arrests are likely in the sensational case.

CBI Joint Director Arun Kumar, who led the search at Talwar’s residence Saturday, tried to recreate the timing of the crime. He went from L-14, where Krishna stayed, to L-32 of the Talwars, through the terrace.

The investigators also questioned guards, security supervisors and a garbage collector.

CBI sources also revealed that an industrialist friend of the Talwars and the Durranis is to be put through a lie detector test. The industrialist, who works with Flex Industries, had lent his car to the Talwars in which they went to Haridwar to cremate Aarushi.